Now, we turn to a new study that could have parents thinking twice about what they feed their kids. It shows how much artificial food dye there is in some popular foods. Dyes that some doctors and parents say can affect your children's behavior. And here more with that is ABC's chief legal health and medical editor, Dr. Richard Besser. Dr. B., why should we as parents or all of us be concerned about artificial food dye? For most people artificial food dye isn't going to cause a problem. But for a small group of children and some with behavioral problem, food dye can worsen behaviors. A lot of our viewers are about to pour a bowl of cereal right now. What do parents need to know? How much? How little? Definitely. Look at your breakfast table. A lot of the foods you may be looking at. The breakfast cereals. The sweet cereals with bright colors, those are artificial dyes. Processed cakes, some breakfast bars. And hopefully nothing you have at breakfast, candy and sodas. A lot have dyes in them. Like the skittles I ate last night? Exactly. Should parents avoid these foods? Be more cautious? There's things you can do. Look at the food. If it's not a color you find in nature, odds are, it's artificial. So, read the label. If you see a color followed by a number. Blue-1, yellow-40. That means it's an artificial dye. I'm as concerned about the sugar in there, as well. Artificial dyes go with a lot of added sugar. Really important information to know. Dr. B., we thank you, as always. We reached out to the international food information council, which said that current research on artificial food colors is found to be safe and not to cause hyperactivity in children.

This transcript has been automatically generated and may not be 100% accurate.

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